D#m7b5 chord
D# half diminished seventh
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The D#m7b5 chord has the formula 1, b3, b5, b7 with notes D#, F#, A, C#
The half diminished seventh chord is a variation of the minor seventh chord and is found in pop, R&B and jazz. It is typically used as a versatile passing chord and its feel is defined by the chord that follows it.